com.espertech.esper.util

Class MultiKeyComparator

java.lang.Object

com.espertech.esper.util.MultiKeyComparator

All Implemented Interfaces:

MetaDefItem, Serializable, Comparator<MultiKeyUntyped>

public final class MultiKeyComparator
extends Object
implements Comparator<MultiKeyUntyped>, MetaDefItem, Serializable

A comparator on multikeys. The multikeys must contain the same number of values.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
MultiKeyComparator(boolean[] isDescendingValues) Ctor.

Method Summary

Modifier and Type	Method and Description
int	compare(MultiKeyUntyped firstValues, MultiKeyUntyped secondValues)
protected static int	compareValues(Object valueOne, Object valueTwo, boolean isDescending) Compares two nullable values.
static int	compareValuesCollated(Object valueOne, Object valueTwo, boolean isDescending, Collator collator) Compares two nullable values using Collator, for use with string-typed values.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

MultiKeyComparator

public MultiKeyComparator(boolean[] isDescendingValues)

Ctor.

Parameters:

isDescendingValues - - each value is true if the corresponding (same index) entry in the multi-keys is to be sorted in descending order. The multikeys to be compared must have the same number of values as this array.

Method Detail

compare

public final int compare(MultiKeyUntyped firstValues,
                         MultiKeyUntyped secondValues)

Specified by:

compare in interface Comparator<MultiKeyUntyped>

compareValues

protected static int compareValues(Object valueOne,
                                   Object valueTwo,
                                   boolean isDescending)

Compares two nullable values.

Parameters:

valueOne - first value to compare

valueTwo - second value to compare

isDescending - true for descending

Returns:

compare result

compareValuesCollated

public static int compareValuesCollated(Object valueOne,
                                        Object valueTwo,
                                        boolean isDescending,
                                        Collator collator)

Compares two nullable values using Collator, for use with string-typed values.

Parameters:

valueOne - first value to compare

valueTwo - second value to compare

isDescending - true for descending

collator - the Collator for comparing

Returns:

compare result